What is the similarity and what is the difference between the process of gas exchange in the lungs and tissues?

The similarity lies in the fact that in both cases, gas exchange occurs through the walls of the capillaries due to diffusion. The difference lies in the fact that during gas exchange in tissues, hemoglobin gives oxygen to cells, takes carbon dioxide, and the blood becomes venous, and the reverse process takes place in the lungs – carbon dioxide from the venous blood through the walls of the alveoli enters the respiratory tract and the external environment, and oxygen in the same way it enters the blood, which becomes arterial and enters into a connection with hemoglobin.

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